Record the last time the user was given their turns/money, store that somewhere for each player, and within your login code you could check if enough time has passed to give them more money. If I remember you can subtract dates/times in php to give you how many hours/minutes has passed, then divide the hours by 24, giving you the days (you would have to round this down of course).
Or you could call a php script to give them their turns/money yourself, but doing something yourself is not allowed in today's world; it's amazing how far we will go to be lazy =]